Coloring-matter lake.



' To all whom May concern:

UNITED STATES PATENT OFFICE.

CARL ;IMMER HEISER, OF LUDWIGSHAFEN-QN-THE-RHINE, GERMANY,

ASSIGNOR TO BADISCHE ANILIN & SODA FABRIK, OF LUDWIGS- HAFEN-ON-THE-RHINE, BAVAR IA, A CORPORATION.

Be it known that I, CARL IMMERHEISER, doctor of philosophy and chemist, a subject of the King of Bavaria, residing at Ludwigshafen-on-the-Rhine, in the Kingdom of Bavaria, German Empire, have invented new and useful Improvements in'Ooloring-Matter Lakes, of which thefollowing is a specifica tion.

alkali in the presence of a substratum com posed of alumina, heavy spar, and the like. Attempts to produce akes containing no other metal but aluminum by making use either of alumina or of aluminum salts have only resulted in lakes which are not sufiiciently fast, and consequently of little or no use in the arts.

I have now discovered that aluminum lakes which possess excellent fastness against the action of water can be produced by combining the coloring-matter with a mixture of alumina and of aluminum salt.

It is essential that both alumina and a salt be used, for onmixing, for'instance, free naph thol yellow acid with excess of alumina only partial precipitation takes place, a art of the coloring-matter remaining in so ution; but on adding a little aluminum chlorid or hydrochloric acid to the mixture the precipitation becomes complete. Thus, to insure a complete;' recipitati'on it is necessary 'to have present a asic aluminum salt. Every basic salt is not suitable; but I have discovered that it is necessary to have present between onesiXth and one twenty-fourth of the quantity of acid which would be suflicient to produce with the alumina a neutral salt. The quantity of acid necessary also depends on the nature of the acid. For instance, for a given quantity of alumina more sulfuric acid is necessary to obtain thebest result than is the case if hydrochloric acid or nitric acid be employed. Thus the basic aluminum sulfate, which is generally prepared by pre- Specification of Letters Patent.

Application filed August 6,1904. Serie1No.219.776.

as hitherto consisted in.

'- .Patented Oct.16, 1906.

cipitation from a solution of aluminum sulfate or of alum b the addition of soda and which is frequent 'y used instead of alumina in the preparation of lakes, although it contains about one-twelfth of theqiiantit of acid necessary to neutralize thew alumina, is too basic to form insoluble lakes and requires the additionv of more acid to form my, new fast lakes.

The most suitable basic aluminum salts-for use according to my invention are those of hydrochloricacid, nitric'acid, acetic acid, and sulfo-cyanic acid.

The basic alumina compounds which form the lakes can either be prepared first, or they can be formed during the roduction of the lake itself.that is to say, in the presence of the coloring-matter. In order to prepare them, alumina, or the above-mentioned basic sulfate of aluminum, or any similar compound of' aluminum which may be too strongly basic for the ur oses of my invention, and conse uentiy oes not combine with the acid co oring-matters to yield the insoluble lakes, can be treated with the quantity of hydrochloric acid, or nitric acid,'or

acetic acid, ascertained as hereinbefore indicated, or, on the other hand, neutral salts of alumina with the acids mentioned or salts which are insufficiently basic can be treated with the corresponding quantity of an alkali, orof alumina, or ofbasic aluminum sulfate till the same result is obtained.

A further method of pre aring these lakeforming basic aluminum sa ts consists in adding to the above mentioned basic aluminum sulfate, at an elevated temperature, certain quantities of barium or lead, salts of hydrochloric acid, nitric acid, or acetic acid. Under these conditions the basic aluminum sulfate is converted into an aluminum salt of the required basicity, since the quantity of hydrochloric acid, or nitric acid, or acetic acid resent is sufficient for the purose indicate whereas its equivalent of sulric acid, which is now precipitated as in soluble sulfate, was not sufficient. It is evident that the barium and lead do not take part in the lake formation, but only form insoluble sulfates, and so increase the amount of substratum present.

0 The formation of the lakes generally takes ole o the I place in the cold, but can sometimes be assisted by warming.

The basicaluminum salts can be used as such for the production of lakes, or they can be employed in conjunction with other indiftogether with a substratum containing some Upon testing the filtrate it will be found to am les.

other metal, (see, for instance, the last part of Example 2,) or the finished lake can be mixed, if desired, with such a substratum; but the lake itself as distinguished from the substratum contains no other metallic element except aluminum. This can readily be ascertained by chemists by treating the en- ,tire mixture with a reagent which will decompose the lake while not attacking the substratum. Thus, for instance, all the lakes that can be obtained according to the following examples can be decomposed by boiling with strong hydrochloric acid, which has no effect on the substratum. U on filtering, the solution contains the-metal ic element of the lake, while the precipitate which re-- mains in the filter consists of the substratum.

contain no other-metal thanaluminum.

The following examples will serve to further illustrate the nature of my invention, which, however, is not limited to these ex- The parts are, by weight. xample 1: Mix together a solution of one (1) part. of light green SF with two hundred (200) parts of a aste of aluminum hydrate, containing four 4) per cent. of Al O H,,. No

lake formation up to this takes lace, but on adding eight (8) parts of dilute ydrochloric acid, containing three and six-tenths (3.6) per-cent. of H01, the coloring-matter is immediately precipitated as an insoluble lake, which is intensely green and can be used either as aste or in the condition of powder.

Examp e 2: Mix together a solution of one (1) part of na hthol yellow S in water with two hundred 200) parts of a paste of aluminum hydrate, containing four (4) ercent. of Al O H The said two components do not form a lake, but on adding to them about ei ht-tenths (0.8) of a part of aluminum ch orid (Al Cl,,+12H O) dissolved in water the coloring-matter is immediately 'precipi tated as an insoluble lake, which is intensely yellow and very transparent. Instead of using the aluminum chlorid of this example equivalent quantities of aluminum sulfate and barium chlorid can be used, the barium sulfate being precipitated and taking no fur-' fiery blue-re ther part in the reaction, while the aluminum chlorid remains to assist in the formation of the basic salt.

Example 3: together a, solution of one (1) part of naphthol yellow in water With two hundred (200) arts of a four (4) per cent. 'aste of basic a nminum sulfate, such as can e obtained by the addition of sodium carbonate to a solution of aluminum sulfate. Now add a solution in water of one and two-tenths (1.2) parts of aluminum chlorid and boil for part of H SO for every four (4) parts of A1 0 No lake formation up to this takes place; but on adding to the mixture six (6) parts of nitric acid, containing ten (10) per cent. of 'HNO and warming slightly the lake is ra idly formedf It is brilliant red and insolu le in water.

Example 5: Mix together-while cold two hundred (200) parts of a four (4) per cent. paste of basic aluminum sulfate and four and a half (4.5) parts of hydrochloric acid, containing about three and a half (3.5) per cent.

of HCl, whereupon the basic aluminum salt suitable for the formation of lakes according to this invention is formed. Now add a solution of one (1) part of brilliant oarmine L in sixty (60) arts of water, whereupon the lake is immediately precipitated. Y

Example 6: Mix together a solution, in

water, of one (1)dpart of naphthol yellow S V with two hundre (200) parts of a four (4) er cent. paste of basic aluminum sulfate.-

he formation of an insoluble lake does not up to this take place; but by adding two (2) parts of barium chlorid (that is, twice as much as is necessary to form the barium salt of the coloring-matter) and warming and then boiling for a short time the true insoluble naphthol yellow lake is formed. This lake can also be produced by using instead of the soluble sodium salt the comparatively diificultly soluble barium. salt of naphthol yellow and then employing a corres ondingly-smaller quantity of barium chlorid Instead of the barium chlorid another barium salt or a lead salt ofthe acids indicated can be employed to convert the basic aluminum sulfate into the lake-forming material and precipitate the sulfuric acid.

Example 7: Dissolve two (2) arts of Eosin L in about fifty (50') parts 0 water,

mix with this one hundred and fifty (10) per cent. paste of precipitated barium sulfate, (permanent white,) and then add four (4) arts of barium chlorid. Boil the whole unt the lake is formed. This colorin -matter lake can be separated in the usua manner and can be used either as a paste or in the form of powder.

Example 8: Mix to ether one hundred and fifty (150) arts of a our (4) per cent. paste of basic a uminum sulfate and fifty (50) parts of a ten (10)per cent. paste of precipitated barium sulfate (permanentwhite) and add to the mixture first a solution in water of two (2) parts of patent blue A and then a solution of four (4) 'parts of barium chlorid. Boil the whole until the formation of the lake is completed. The lake so obtained possesses a pure-blue color and is Very fast against the action of water.

Now what I claim is 1. The process for the roduction of coloring-matter lakes containing no other metal than aluminum, by mixing an acid coloringmatter with a hereinbefore-described basic aluminum salt which contains substantially between one-sixth and one twenty-fourth of the acid necessary to form a neutral salt.-

oring-matter, 8 substratum and a hereinbe' fore-described basic aluminum salt which contains substantially between one-sixth and one twenty-fourth of the acid necessary to form a neutral salt.

4. The new com osition of matter being a coloring-matter la e containing naphthol yellow and a hereinbefore-described basic aluminum salt which contains substantially betweenone-sixth and one twenty-fourth of-v the acid necessary to form a neutral salt. v

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

' CARL IMMERHEISER. Witnesses: 

